Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: question: onde obama obteve 39.8%
 ###Tabelas: CREATE TABLE by_county (by_county_id AUTO_INCREMENT PRIMARY KEY, County VARCHAR, McCain # INT, McCain % VARCHAR, Obama # INT, Obama % VARCHAR) CREATE TABLE winningest_coaches_by_wins (winningest_coaches_by_wins_id AUTO_INCREMENT PRIMARY KEY, Coach VARCHAR, Team VARCHAR, Wins INT, Loss INT, PCT. INT, PTS. INT) CREATE TABLE owned_and_operated_stations_of_other_networks (owned_and_operated_stations_of_other_networks_id AUTO_INCREMENT PRIMARY KEY, City VARCHAR, State or Territory VARCHAR, Station call sign VARCHAR, Network VARCHAR, Channel number INT, Programs Aired VARCHAR) CREATE TABLE playing_career_statistics (playing_career_statistics_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, League Apps (sub) VARCHAR, League Goals VARCHAR, Cup Apps (sub) VARCHAR, Cup Goals VARCHAR, Total Apps (Sub) VARCHAR, Total Goals VARCHAR) CREATE TABLE republic_of_korea_1948-presents (republic_of_korea_1948-presents_id AUTO_INCREMENT PRIMARY KEY, President VARCHAR, Vice INT, Romanized (Hangul) VARCHAR, Took office VARCHAR, Left office VARCHAR, Political party VARCHAR)  
SELECT County FROM by_county WHERE Obama % = 39.8%